VMware VSHIELD MANAGER 4.1.0 UPDATE 1 - API Manual do Utilizador descarregar pdf (Página 28)

vShield Administration Guide

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Default Rules

Bydefault,ZonesFirewallenforcesasetofrulesallowingtraffictopassthroughallvShieldZonesinstances.

TheserulesappearintheDefaultRulessectionoftheZonesFirewalltable.Thedefaultrulescannotbedeleted

oraddedto.However,youcanchangetheActionelementofeachrulefrom

AllowtoDeny.

Layer 4 Rules and Layer 2/Layer 3 Rules

ZonesFirew allofferstwosetsofconfigurablerules:L4(Layer4)rulesandL2/L3(Layer2/Layer3)rules.Layers

refertolayersoftheOpenSystemsInterconnection(OSI)ReferenceModel.

Layer4rulesgovernTCPandUDPtransportofLayer7,orapplication‐specific,traffic.Layer2/Layer3rules

monitortraffic

fromICMP,ARP,andotherLayer2andLayer3protocols.YoucanconfigureLayer2/Layer 3

rulesatthedatacenterlevelonly.Bydefault,allLayer4andLayer2/Layer3trafficisallowedtopass.

Hierarchy of Zones Firewall Rules

EachvShieldZonesinstanceenforcesZonesFirewallrulesintop‐to‐bottomordering.AvShieldZones

instancecheckseachtrafficsessionagainstthetopruleintheZonesFirewalltablebeforemovingdownthe

subsequentrulesinthetable.Thefirstruleinthetablethatmatchesthetrafficparametersis

enforced.

ZonesFirewallrulesareenforcedinthefollowinghierarchy:

1 DataCenterHighPrecedenceRules

2 ClusterLevelRules

3 DataCenterLowPrecedenceRules(seenasRulesbelowthislevelhavelowerprecedencethancluster

levelruleswhenadatacenterresourceisselected)

4 SecurePortGroupRules

5 DefaultRules

ZonesFirewalloffers

container‐levelandcustompriorityprecedenceconfigurations:

 Container‐levelprecedencereferstorecognizingthedatacenterlev elasbeinghigherinprioritythanthe

clusterlevel.Whenaruleisconfiguredatthedatacenterlevel,theruleisinheritedbyallclustersand

vShieldagentstherein.Acluster‐levelruleisonlyappliedtothevShieldZonesinstanceswithin

the

cluster.

 Custompriorityprecedencereferstotheoptionofassigninghighorlowprecedencetorulesatthe

datacenterlevel.Highprecedencerulesworkasnotedinthecontainer‐levelprecedencedescription.Low

precedencerulesincludetheDefaultRulesandtheconfigurationofDataCenterLowPrecedencerules.

Thisflexibilityallowsyou

torecognizemultiplelayersofappliedprecedence.

Attheclusterlevel,youconfigurerulesthatapplytoallvShieldZonesinstanceswithinthecluster.

BecauseDataCenterHighPrecedenceRulesareaboveClusterLevelRules,ensureyourClusterLevel

RulesarenotinconflictwithDataCenterHighPrecedenceRules.

Planning Zones Firewall Rule Enforcement

UsingZonesFirewall,youcanconfigureallowanddenyrulesbasedonyournetworkpolicy.Thefollowing

examplesrepresenttwocommonfirewallpolicies:

 Allowalltrafficbydefault.YoukeepthedefaultallowallrulesandadddenyrulesbasedonFlow

MonitoringdataormanualAppFirewallconfiguration.Inthisscenario,ifasessiondoesnotmatchany

ofthedenyrules,thevShieldAppallowsthetraffictopass.

 Denyalltrafficbydefault.YoucanchangetheActionstatusofthedefaultrulesfromAllowtoDeny,and

addallowrulesexplicitlyforspecificsystemsandapplications.Inthisscenario,ifasessiondoesnot

matchanyoftheallowrules,thevShieldAppdropsthesessionbeforeit

reachesitsdestination.Ifyou

changeallofthedefaultrulestodenyanytraffic,thevShieldAppdropsallincomingandoutgoingtraffic.

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